US3360672A - Parallel light fibers with longitudinal axes making oblique angle with display surface of cathode ray tubes - Google Patents

Parallel light fibers with longitudinal axes making oblique angle with display surface of cathode ray tubes Download PDF

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Publication number
US3360672A
US3360672A US522134A US52213466A US3360672A US 3360672 A US3360672 A US 3360672A US 522134 A US522134 A US 522134A US 52213466 A US52213466 A US 52213466A US 3360672 A US3360672 A US 3360672A
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US
United States
Prior art keywords
longitudinal axes
oblique angle
fibres
cathode ray
screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US522134A
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English (en)
Inventor
Marshall Gerald Francis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ferranti International PLC
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Ferranti PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ferranti PLC filed Critical Ferranti PLC
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Publication of US3360672A publication Critical patent/US3360672A/en
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
    • G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
    • G02B6/08—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images with fibre bundle in form of plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/24—Supports for luminescent material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H01J29/892—Optical or photographic arrangements structurally combined or co-operating with the vessel using fibre optics

Definitions

  • This invention relates to display screens of the type having front and back surfaces, on the back surface of which an optical image may be formed for observation through the front surface.
  • observer is taken to indicate not only a human observer, but also indirect means such as television and photographic cameras.
  • a display screen having front and back surfaces, on the back surface of which an optical image may be formed for observation through the front surface, said screen comprising aplurality of light-transmitting fibres arranged with their longitudinal axes substantially parallel to one another, each fibre consisting of a core of substantially transparent material coated over its longitudinal surface with a material having a refractive index lower than that of said transparent material, said plurality of fibres being arranged with their longitudinal axes inclined at an oblique angle to at least the viewed surface of said screen such that an image is viewable through the front surface of said screen.
  • a cathode-ray tube 10 has a conventional envelope 11 with' ii lay'ef"of phosphor 12 adjacent to the face-plate 13.
  • This face-plate 13 is 5 made up of a ver lafge number of short optical fibres 14, shown exaggerated in size for clarity, arra n g dwvith their axes parallel to one another and at an angle to the two surfaces of the face-plate. The obliquity of the fibres has also been exaggerated.
  • the method of construction of such a face-plate is not the subject of this invention, since it is very similar to the method used to make face-plates in which the axes of the fibres are perpendicular to the surfaces of the face-plate.
  • each fibre consists of a core of glass or a similar material having a high refractive index coated with a layer of glass or similar material having a refractive index lower than that of the core material.
  • the core of each fibre may be made from a phosphor materiaL-The construction of the fibres is not shown in the drawing.
  • the operation of the display screen is as follows.
  • An optical image is formed by the phosphor and hence appears on the inner surface of the face-plate.
  • Light travels along the fibres 14 to the front surface of the face-plate where the angle of the end of each fibre produces the effect of a prism.
  • the rays of light 15 emerge from the face-plate at a more oblique angle than the inclination of the fibres. It is necessary to view the image along a direction substantially parallel to the emergent rays of light 15.
  • Ambient light falling on the front surface of the face-plate from any direction except that shown at 16 will be reflected away from the field of view. This applies especially to light reflected from an observer-s face which is often the cause of reflections when viewing the screen along a normal to its surface.
  • the screen forms the faceplate of a cathode-ray tube it is covered with a layer of plain glass to ensure vacuum-tightness. Reflections from the glass layer are reduced in the same way by virtue of the oblique viewing, and if the glass layer is thin no appreciable distortion of the image will occur.
  • the two opposite surfaces of the screen 13 are parallel there will be no distortion of the image. If, however, the two surfaces are not parallel the image will be distorted, this distortion being in the form of foreshortening, or lengthening, in the direction of inclination of the fibres. Preferably therefore, the two surfaces are made parallel to one another.
  • a prism may be used to compensate for the obliquity of the light rays emerging from the screen.
  • the prism itself also reduces specular reflections from the viewed surface of the screen.
  • the angle of inclination of'the fibres to the front face of the tube is arranged so as to reduce specular reflection to a minimum, this depending upon the conditions under which the screen is to be used.
  • a display screen for a cathode-ray tube comprising a plurality of light transmitting fibres arranged with their longitudinal axes substantially parallel to one another, each fibre consisting of a core of substantially transparent material coated over its longitudinal surfaces with a material having a refractive index lower than said transparent material, said plurality of fibres terminating at one end to form a front surface in a viewing plane normal to the horizontal axis of the cathode-ray tube and at the other end to form a back surface substantially parallel to the front surface, a phosphor layer on the back surface by References Cited UNITED STATES PATENTS Malpica 313-92 X Fyler 313-92 Hays 31392 X Turner 31392 ROBERT SEGAL, Primary Examiner.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
US522134A 1965-01-26 1966-01-21 Parallel light fibers with longitudinal axes making oblique angle with display surface of cathode ray tubes Expired - Lifetime US3360672A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3333/65A GB1067149A (en) 1965-01-26 1965-01-26 Improvements relating to display screens

Publications (1)

Publication Number Publication Date
US3360672A true US3360672A (en) 1967-12-26

Family

ID=9756335

Family Applications (1)

Application Number Title Priority Date Filing Date
US522134A Expired - Lifetime US3360672A (en) 1965-01-26 1966-01-21 Parallel light fibers with longitudinal axes making oblique angle with display surface of cathode ray tubes

Country Status (4)

Country Link
US (1) US3360672A (enrdf_load_stackoverflow)
DE (1) DE1622864A1 (enrdf_load_stackoverflow)
GB (1) GB1067149A (enrdf_load_stackoverflow)
NL (1) NL6600717A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661065A (en) * 1968-02-08 1972-05-09 Yasuo Yamazaki Device for optical focusing a glass fiber plate as a focusing screen
US4017157A (en) * 1974-03-26 1977-04-12 Maatschappij Van Berkel's Patent N.V. Apparatus for the digital display or recording of data
US4227187A (en) * 1979-03-30 1980-10-07 The United States Of America As Represented By The Secretary Of The Air Force High speed real time quantizer and analog/digital converter
US4344668A (en) * 1980-03-17 1982-08-17 Hughes Aircraft Company Fiber optic light traps for electro-optical display devices
US4855045A (en) * 1982-01-14 1989-08-08 Reed Thomas A Method and apparatus for the separation of organic substances from a suspension or solution
US4914349A (en) * 1986-10-27 1990-04-03 Hamamatsu Photonics Kabushiki Kaisha Photo-electric conversion tube with optical fiber plate
EP1325362A4 (en) * 2000-07-14 2005-06-01 Gates Corp SIGNAL LENS SYSTEM

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062993A1 (en) * 1981-04-09 1982-10-20 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Cathode ray tube phosphor layers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091152A (en) * 1936-06-17 1937-08-24 Gen Electric Oscillograph
US3237039A (en) * 1961-04-17 1966-02-22 Litton Prec Products Inc Cathode ray tube using fiber optics faceplate
US3255003A (en) * 1961-09-18 1966-06-07 American Optical Corp Method of making cathode ray tube face plates
US3311773A (en) * 1961-12-06 1967-03-28 Ferranti Ltd Phosphor fibre face plate for cathode-ray tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091152A (en) * 1936-06-17 1937-08-24 Gen Electric Oscillograph
US3237039A (en) * 1961-04-17 1966-02-22 Litton Prec Products Inc Cathode ray tube using fiber optics faceplate
US3255003A (en) * 1961-09-18 1966-06-07 American Optical Corp Method of making cathode ray tube face plates
US3311773A (en) * 1961-12-06 1967-03-28 Ferranti Ltd Phosphor fibre face plate for cathode-ray tubes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661065A (en) * 1968-02-08 1972-05-09 Yasuo Yamazaki Device for optical focusing a glass fiber plate as a focusing screen
US4017157A (en) * 1974-03-26 1977-04-12 Maatschappij Van Berkel's Patent N.V. Apparatus for the digital display or recording of data
US4227187A (en) * 1979-03-30 1980-10-07 The United States Of America As Represented By The Secretary Of The Air Force High speed real time quantizer and analog/digital converter
US4344668A (en) * 1980-03-17 1982-08-17 Hughes Aircraft Company Fiber optic light traps for electro-optical display devices
US4855045A (en) * 1982-01-14 1989-08-08 Reed Thomas A Method and apparatus for the separation of organic substances from a suspension or solution
US4914349A (en) * 1986-10-27 1990-04-03 Hamamatsu Photonics Kabushiki Kaisha Photo-electric conversion tube with optical fiber plate
EP1325362A4 (en) * 2000-07-14 2005-06-01 Gates Corp SIGNAL LENS SYSTEM

Also Published As

Publication number Publication date
DE1622864A1 (de) 1970-03-05
GB1067149A (en) 1967-05-03
NL6600717A (enrdf_load_stackoverflow) 1966-07-27

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